var index = 1;
        function lunbo(){
            index ++ ;
            if(index > 3){
                index = 1;
            }
            var img = document.getElementById("lunbo_img");
            img.src = "img/img"+index+".jpeg";
        }
        setInterval(lunbo,1500);
        function fun(){
            window.location.assign('https://www.meishij.net/china-food/')
                 }
            